On war declare nothing happens, just error in console
[18:44:20]Failed to call hook 'OnWarCommand' on plugin 'Imperium v2.2.3' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.Imperium+<OnWarDeclareCommand>c__AnonStorey3.<>m__0 (Oxide.Plugins.Imperium+User u) [0x00006] in <bb4e149e6a6a4b50af2c02aae294280c>:0
at System.Linq.Enumerable+WhereArrayIterator`1[TSource].ToArray () [0x00022] in <351e49e2a5bf4fd6beabb458ce2255f3>:0
at System.Linq.Enumerable.ToArray[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x0001f] in <351e49e2a5bf4fd6beabb458ce2255f3>:0
at Oxide.Plugins.Imperium.OnWarDeclareCommand (Oxide.Plugins.Imperium+User user, System.String[] args) [0x00336] in <bb4e149e6a6a4b50af2c02aae294280c>:0
at Oxide.Plugins.Imperium.OnWarCommand (BasePlayer player, System.String command, System.String[] args) [0x0013e] in <bb4e149e6a6a4b50af2c02aae294280c>:0
at Oxide.Plugins.Imperium.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x01f8d] in <bb4e149e6a6a4b50af2c02aae294280c>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <09575a60985045248bcb43b20faeeb99>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0
help please to solve